Microsoft is working on a significant new feature for Windows Vista, known as Restart Manager, which is designed to update parts of the operating system or applications without having to reboot the entire machine. "If a part of an application, or the operating system itself, needs to updated, the Installer will call the Restart Manager, which looks to see if it can clear that part of the system so that it can be updated. If it can do that, it does, and that happens without a reboot." And here & here are some more shots of Vista build 5259.